Poinsettias bracts, they're similar to leaves, turn red with the shortening amount of light during the day. They will turn red if you keep them dark for more them 14 or 15 hours a day. But it is not as simple as that. They need to be producing flowers to produce the bracts that turn red so just putting your plant in the airing cupboard (do people still have them?) won't necessarily give you a good result.
How do you get aging green poinsettia plants to grow red leaves again?! maybe you can't!?
you have to put them in the dark for a while. I am not sure how long it takes. I have some white ones %26amp; I tried it for 2wks, they were starting to turn.
how to grow lilacs
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